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Resonator

RK (Rudolph Koenig monogram stamped on the rim of the larger orifice). 2 (Koenig series number stamped on the rim of the larger orifice). UT3 (Koenig frequency notation stamped on the rim of the larger orifice). DES after HELMHOLTZ,Hermann,Ludwig,Ferdinand,Professor,von. circa 1856 Bonn, Germany. MANU Rudolph Koenig. circa 1866 30 rue Hautfille, Paris, France. This is a spherical Helmholtz's reson…